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soc: ti: omap-prm: poll for reset complete during de-assert

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Poll for reset completion status during de-assertion of reset, otherwise
the IP in question might be accessed before it has left reset properly.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
This commit is contained in:
Tero Kristo 2019-10-09 08:55:37 -07:00 committed by Santosh Shilimkar
parent 3e99cb214f
commit c5117a78dd
1 changed files with 12 additions and 0 deletions
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12
drivers/soc/ti/omap_prm.c
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@ -152,6 +152,18 @@ static int omap_reset_deassert(struct reset_controller_dev *rcdev,
writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);
spin_unlock_irqrestore(&reset->lock, flags);
if (!has_rstst)
return 0;
/* wait for the status to be set */
ret = readl_relaxed_poll_timeout(reset->prm->base +
reset->prm->data->rstst,
v, v & BIT(st_bit), 1,
OMAP_RESET_MAX_WAIT);
if (ret)
pr_err("%s: timedout waiting for %s:%lu\n", __func__,
reset->prm->data->name, id);
return 0;
}